ICD code Z94.2 – Lung transplant status

Key takeaways

Z94.2 is the billable ICD-10-CM code for lung transplant status, covering a single, double, or lobar lung graft that is still in place.

Report Z94.2 as an additional code, since it describes the patient’s history rather than the reason for today’s visit.

When the provider documents rejection, failure, or infection of the graft, replace Z94.2 with a T86.81- code plus a code for the complication.

A heart-lung recipient takes Z94.3, and a post-transplant aftercare visit leads with Z48.24 rather than Z94.2.

ICD-10 code Z94.2: Quick reference

ICD-10 code Z94.2 is the billable code for lung transplant status. It tells the payer that the patient lives with a transplanted lung. Z94.2 belongs to category Z94, Transplanted organ and tissue status, in Chapter 21 of ICD-10-CM (Z00-Z99). The CDC/NCHS ICD-10-CM code tool lists it as billable, with the same descriptor in the FY2026 code set.

What ICD-10 code Z94.2 covers

Z94.2 applies to any patient who has received a lung transplant and still has the graft in place. The code does not split by technique, so each scenario below takes Z94.2 once the transplant admission is over.

• Single lung transplant: one native lung is replaced with a donor lung.
• Bilateral (double) lung transplant: both lungs are replaced, the usual approach for cystic fibrosis, where an infected native lung could seed the new one.
• Lobar transplant: a donor lobe, sometimes from a living donor, replaces the recipient’s lung.
• Retransplant: a patient on a second, functioning lung graft still takes Z94.2 for the graft in place.

The ICD-10-CM index sends “lung(s)” under Transplant status to Z94.2. Laterality and the number of lungs never change the code.

Who reports Z94.2

Transplant pulmonology teams report Z94.2 most often, but any provider treating the patient can add it. The Official Guidelines call a status code informative, because the status may affect the course of treatment and its outcome. Lifelong immunosuppression changes how a primary care, dermatology, or infectious disease visit is managed, so the status belongs on those claims too.

What Z94.2 does not cover: Exclusions and limitations

Z94.2 records status only. It stops applying once the chart documents a problem with the graft, and it never stands in for another organ.

• Lung transplant complications (T86.810-T86.819): rejection, failure, infection, or another complication of the lung graft. Category Z94 carries an Excludes1 note for complications of transplanted organs.
• Heart and lungs transplant status (Z94.3): a combined heart-lung graft has its own status code, and its complications sit in T86.3-.
• Heart transplant status (Z94.1): a heart transplant alone, with no lung graft.
• Awaiting organ transplant status (Z76.82): a patient on the waiting list has not received the graft yet.
• Transplanted organ removal status (Z98.85): used once a transplanted organ has been removed, but not on the encounter for the removal itself.
• The transplant admission: Z94.2 documents status after the operation, not during the encounter for the transplant surgery.

The Official Guidelines (Section I.C.21.c.3) state the rule directly. A status code is not used with a body-system code that already carries the same information. Their example pairs Z94.1 with T86.2-, and the same logic keeps Z94.2 off a claim that carries T86.81-.

Neighboring codes you must know

Category Z94 runs from Z94.0 to Z94.9, and a chart that says “transplant” without naming the organ invites the wrong code. Two other codes are easy to confuse with Z94.2. Corneal transplant status is Z94.7, and the presence of a prosthetic heart valve is Z95.2.

Primary vs secondary diagnosis: When to use ICD-10 code Z94.2

Z94.2 is almost always an additional code. The Official Guidelines allow a Z code to be first-listed or secondary, depending on the encounter. A status code describes the patient rather than the reason for the visit, so it rarely belongs first.

For a lung transplant recipient seen for an unrelated problem, the sequencing works like this:

1. First-listed diagnosis: the condition that prompted today’s visit, such as a urinary tract infection or a skin lesion check.
2. Additional diagnosis: Z94.2, to show that the patient has a transplanted lung.
3. Supporting codes, where documented: long-term immunosuppressant use from Z79.62-, such as Z79.621 for tacrolimus, or Z99.81 for dependence on supplemental oxygen.

Two sequencing errors cause avoidable rework. One is sending Z94.2 as the only code on the claim. The other is listing it first when an unrelated condition drove the visit. If the new problem affects the lung graft itself, it is a transplant complication, and the T86.81- rules below apply instead.

Three checks decide whether Z94.2 belongs on the claim at all, and the order you run them in matters.

Documentation requirements to support Z94.2

A claim with Z94.2 needs documentation showing that the transplant happened and that the graft is still in place. Auditors look for three elements:

• Transplant history: the type of procedure (single, bilateral, or lobar), where it was performed, and the date.
• Current-status language: the encounter note should state that the graft is present and describe how it is functioning. A past operative note alone does not support today’s claim.
• Clinical relevance: the note should show why the status matters to today’s care, such as checking a new prescription against the immunosuppressant regimen.

Documentation prompts for post-transplant visits help providers record the status language under time pressure. They are a practical part of medical billing compliance for any practice that follows transplant recipients.

Aftercare coding: Z48.24 and Z94.2

When the visit exists because of the transplant, Z48.24 is the first-listed code. Its full title is “Encounter for aftercare following lung transplant.” Scheduled graft surveillance and immunosuppressant management during recovery are typical examples.

Adding Z94.2 to that claim looks natural, but the aftercare guideline (Section I.C.21.c.7) points the other way. It says a status code should not be used when the aftercare code already indicates the type of status. Z48.24 already names the lung transplant, so Z94.2 adds no information next to it.

The aftercare code has limits of its own. The guideline bars an aftercare Z code when treatment is directed at a current, acute disease. A patient treated for acute rejection gets T86.810, not Z48.24.

Heart-lung recipients take Z48.280, Encounter for aftercare following heart-lung transplant. Z48.288, Encounter for aftercare following multiple organ transplant, covers other combinations of transplanted organs.

In Pabau’s claims management software, you can set up code pairing templates by visit reason. A surveillance visit then starts from Z48.24, while an unrelated visit adds Z94.2 as an additional code.

When the graft fails: Switching from Z94.2 to T86.81-

When the provider documents a complication that affects the lung graft, a T86.81- code replaces Z94.2. The two are not reported together for the same graft. An infected graft, for example, codes to T86.812 with a second code that names the infection.

Section I.C.19.g.3.a sets two conditions for these codes. A T86 code applies only when the complication affects the function of the transplanted organ. It also needs a second code that identifies the complication.

Chronic lung allograft dysfunction shows how the pairing works. The tabular list says to code T86.810 or T86.818 first, then add a J4A.- code for the dysfunction. J44.81 is added where bronchiolitis obliterans syndrome is documented.

A condition that develops after the transplant without affecting the graft is not a complication. Code it on its own, with Z94.2 as an additional code. Once a rejection episode resolves and the graft is stable, Z94.2 returns at later visits. Heart-lung grafts use T86.3- instead, because T86.81 excludes them.

Payer requirements and prior authorization for Z94.2 visits

Z94.2 is a diagnosis code, so it does not trigger prior authorization by itself. Payers focus on the services billed alongside it. For post-transplant pulmonary visits, that usually means:

• Medical necessity documentation: the note must show a clinical reason for each service, such as spirometry to track graft function or a surveillance bronchoscopy.
• Linked diagnoses: each billed service should point to the diagnosis that supports it on the same claim.
• Medicare coverage policies: local coverage determinations can list the diagnoses that support a given test. Check the policy for your contractor, and confirm code updates on the CMS ICD-10 codes page.
• Immunosuppressant drug coverage: drugs such as tacrolimus usually go through the pharmacy benefit, separately from the office visit claim.

Authorization rules vary by payer and plan year, so confirm them before each encounter. Running insurance eligibility verification at every post-transplant visit catches plan changes before they reach the claim.

Pabau connects to Claim.MD, a clearinghouse, for real-time eligibility checks and electronic claim submission on post-transplant encounters.

Common claim denial reasons for Z94.2 and how to avoid them

Z94.2 denials cluster around a small set of repeat mistakes. Your remittance data shows which of them is active in your practice.

Tracking CARC codes on Z94.2 remittances is part of systematic denial management in healthcare. A clean claim submission for these visits rests on three points: correct sequencing, documented graft status, and the right companion code.

How Pabau supports lung transplant status coding

A lung transplant recipient comes back for years of follow-up. Each visit needs the right choice between Z94.2, Z48.24, and a T86.81- code. When the transplant history lives in scanned letters, coders rebuild it at every visit, and sequencing errors slip through.

Pabau keeps the transplant type and date on the patient record, where every provider sees it before the consultation. Code pairing templates load the right combination for each visit type. Claims then go out through the Claim.MD integration, and denials come back to one worklist.

The outcome is fewer claims returned for sequencing, and less time spent chasing transplant history before each claim goes out.

Streamline your transplant follow-up billing

Pabau brings ICD-10 documentation, claim submission, and eligibility checks into one place for pulmonary and specialty practices. Your team spends less time on rework and more on patient care.

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Conclusion

Z94.2 earns its place only when the lung graft is stable and something else brought the patient in. Every other post-transplant visit belongs to a different code, whether that is Z94.3, Z48.24, or a T86.81- code.

Build that decision into your visit templates once, and coders stop re-deciding it at every follow-up. The trade-off is upkeep, because the templates need a check against each October code set update.

Book a demo to see how Pabau keeps post-transplant claims sequenced correctly from the first follow-up.

Continue your research

Dealing with claim denials across your practice? Denial codes in medical billing maps CARC and RARC denial codes to corrective actions so your billing team can resolve remittances faster.

Want to understand how the claims submission process works end to end? Medical claims clearinghouse explains how claims move from practice to payer and where ICD-10 code accuracy affects adjudication outcomes.

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